GRADE CROSSING FLASHER - v3
 
- suitable for a grade crossing
- outputs for alternately flashing LEDs as warning lights
- output for single flashing LED as free crossing
- power supply: 6-15V DC
- input for a switch, reed relay, or infra sensor
- flashing frequency: 0.6 Hz
- suitable for lights with common anode
- output voltage: same as the input voltage
- 5V DC output for IR sensor or Hall sensor (500 mA)
- output current: 400mA / output (altogether 1200 mA)
- size: 35 x 22 mm
 
Description:
After connecting the power supply, the bulb or LED connected to the 3rd output starts flashing, indicating the gateway is free (optional).
 
The sensors are connected to the S1 and S2 inputs. In the case of the Reed sensor, the other leg is connected to the GND (pin 0). The 5V power supply can be provided from the 0 and +5V outputs when using an Infrared or Hall sensor.
 
When the S1 input is low (train arrives), outputs 1 and 2 start flashing alternately. Then the S2 input is switched to a leaving sensor, so only this input can turn off the red lights.
When the train covers the S2 sensor, keep flashing until the sensor stays uncovered for at least 1,5 seconds (the last wagon leaves the sensor), then the warning lights go off. 
 
If the S2 input is covered first, the entire cycle will operate based on the above, and the S1 will be the leaving sensor.